激光诱导击穿光谱检测冶炼厂土壤中铬元素系统参数优化研究  

Parameter Optimization of LIBS in Detecting Chromium in Smelter Soil

作　　者：黎文兵[1] 姚明印[1] 郑建鸿[1] 何秀文[1] 樊十全[1] 陈添兵[1] 林永增[1] 郑美兰[1] 刘木华[1] 

机构地区：[1]江西农业大学生物光电与应用重点实验室,江西南昌330045

出　　处：《江西农业大学学报》2013年第4期887-891,共5页Acta Agriculturae Universitatis Jiangxiensis

基　　金：国家自然科学基金项目(31271612);江西省教育厅科技计划项目(GJJ12249);江西省学术带头人计划项目(09004004)

摘　　要：为了探索激光诱导击穿光谱(laser-induced breakdown spectroscopy,LIBS)快速检测土壤中铬元素的可行性,采用1 064 nm的Nd:YAG纳秒脉冲激光器作为激光光源,对冶炼厂土壤中的Cr元素进行了参数优化分析,通过获取的样品LIBS光谱得出Cr(Ⅰ)425.435 nm为最佳分析谱线;通过信背比、强度与激光能量的关系曲线,得出最佳能量为140 mJ;通过信背比、强度与延时时间的关系曲线,得出最佳延迟时间为1.4μs。结果表明,对LIBS参数优化可以提高其鉴别目标元素的能力,该参数优化方法也适用于检测土壤中其他重金属元素的研究。In order to explore the feasibility of detecting chromium in soil rapidly by laser-induced break- down spectroscopy, this experiment used 1 064 nm Nd：YAG nanosecond laser as the laser light source, opti- mized the parameters for chrome in the smelters soil, chose Cr （ I ） 425. 435 nm as the analytical spectral lines;then made the relation curve with signal -to -background ratio, strength and different laser energy , the result showed that the optimum energy was 140 mJ;the relation curve with signal-to-background ratio, strength and different delay time, showed that the optimum delay time was 1.4 μs ; All this show that ： optimizing param- eters for LIBS can improve its ability to identify the target element , and the research method in this paper is al- so suitable for detecting other heavy metal elements in soil.

关 键 词：激光诱导击穿光谱 土壤 铬 参数优化 

分 类 号：TN247[电子电信—物理电子学]